In my "build everything" tree, changing sysemu/sysemu.h triggers a recompile of some 5400 out of 6600 objects (not counting tests and objects that don't depend on qemu/osdep.h). Almost a third of its inclusions are actually superfluous. Delete them. Downgrade two more to qapi/qapi-types-run-state.h, and move one from char/serial.h to char/serial.c. hw/semihosting/config.c, monitor/monitor.c, qdev-monitor.c, and stubs/semihost.c define variables declared in sysemu/sysemu.h without including it. The compiler is cool with that, but include it anyway. This doesn't reduce actual use much, as it's still included into widely included headers. The next commit will tackle that. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20190812052359.30071-27-armbru@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
166 lines
4.5 KiB
C
166 lines
4.5 KiB
C
/*
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* QEMU sPAPR random number generator "device" for H_RANDOM hypercall
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*
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* Copyright 2015 Thomas Huth, Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License,
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* or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "cpu.h"
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#include "qemu/error-report.h"
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#include "qemu/main-loop.h"
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#include "qemu/module.h"
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#include "sysemu/device_tree.h"
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#include "sysemu/rng.h"
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#include "hw/ppc/spapr.h"
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#include "hw/qdev-properties.h"
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#include "kvm_ppc.h"
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#define SPAPR_RNG(obj) \
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OBJECT_CHECK(SpaprRngState, (obj), TYPE_SPAPR_RNG)
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struct SpaprRngState {
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/*< private >*/
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DeviceState ds;
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RngBackend *backend;
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bool use_kvm;
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};
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typedef struct SpaprRngState SpaprRngState;
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struct HRandomData {
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QemuSemaphore sem;
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union {
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uint64_t v64;
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uint8_t v8[8];
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} val;
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int received;
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};
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typedef struct HRandomData HRandomData;
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/* Callback function for the RngBackend */
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static void random_recv(void *dest, const void *src, size_t size)
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{
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HRandomData *hrdp = dest;
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if (src && size > 0) {
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assert(size + hrdp->received <= sizeof(hrdp->val.v8));
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memcpy(&hrdp->val.v8[hrdp->received], src, size);
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hrdp->received += size;
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}
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qemu_sem_post(&hrdp->sem);
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}
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/* Handler for the H_RANDOM hypercall */
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static target_ulong h_random(PowerPCCPU *cpu, SpaprMachineState *spapr,
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target_ulong opcode, target_ulong *args)
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{
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SpaprRngState *rngstate;
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HRandomData hrdata;
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rngstate = SPAPR_RNG(object_resolve_path_type("", TYPE_SPAPR_RNG, NULL));
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if (!rngstate || !rngstate->backend) {
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return H_HARDWARE;
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}
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qemu_sem_init(&hrdata.sem, 0);
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hrdata.val.v64 = 0;
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hrdata.received = 0;
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while (hrdata.received < 8) {
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rng_backend_request_entropy(rngstate->backend, 8 - hrdata.received,
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random_recv, &hrdata);
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qemu_mutex_unlock_iothread();
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qemu_sem_wait(&hrdata.sem);
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qemu_mutex_lock_iothread();
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}
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qemu_sem_destroy(&hrdata.sem);
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args[0] = hrdata.val.v64;
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return H_SUCCESS;
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}
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static void spapr_rng_instance_init(Object *obj)
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{
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if (object_resolve_path_type("", TYPE_SPAPR_RNG, NULL) != NULL) {
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error_report("spapr-rng can not be instantiated twice!");
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return;
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}
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object_property_set_description(obj, "rng",
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"ID of the random number generator backend",
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NULL);
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}
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static void spapr_rng_realize(DeviceState *dev, Error **errp)
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{
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SpaprRngState *rngstate = SPAPR_RNG(dev);
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if (rngstate->use_kvm) {
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if (kvmppc_enable_hwrng() == 0) {
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return;
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}
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/*
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* If user specified both, use-kvm and a backend, we fall back to
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* the backend now. If not, provide an appropriate error message.
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*/
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if (!rngstate->backend) {
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error_setg(errp, "Could not initialize in-kernel H_RANDOM call!");
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return;
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}
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}
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if (rngstate->backend) {
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spapr_register_hypercall(H_RANDOM, h_random);
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} else {
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error_setg(errp, "spapr-rng needs an RNG backend!");
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}
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}
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static Property spapr_rng_properties[] = {
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DEFINE_PROP_BOOL("use-kvm", SpaprRngState, use_kvm, false),
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DEFINE_PROP_LINK("rng", SpaprRngState, backend, TYPE_RNG_BACKEND,
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RngBackend *),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void spapr_rng_class_init(ObjectClass *oc, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(oc);
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dc->realize = spapr_rng_realize;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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dc->props = spapr_rng_properties;
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dc->hotpluggable = false;
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}
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static const TypeInfo spapr_rng_info = {
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.name = TYPE_SPAPR_RNG,
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.parent = TYPE_DEVICE,
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.instance_size = sizeof(SpaprRngState),
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.instance_init = spapr_rng_instance_init,
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.class_init = spapr_rng_class_init,
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};
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static void spapr_rng_register_type(void)
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{
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type_register_static(&spapr_rng_info);
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}
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type_init(spapr_rng_register_type)
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